http://www.amazon.com/PNY-GeForce-Graphics-Cards-VCGGTX660TXPB/dp/B008TN8782/ref=sr_1_10?ie=UTF8&qid=1362181936&sr=8-10&keywords=660+ti $275 http://www.notebookcheck.net/typo3temp/pics/4bc85f9d5a.jpg
PSU/motherboard/HDD/dvd etc. should add to another $200
So around $800 in total. Will max out FC3 at 1080p/30 fps.
edit: I misunderstood OP l0l. Thought I was given a challenge.